"One" does not a debate make....
However, there is the equal time rule and he is entitled to the same "sponsored" time consumed by the scheduled debate.
The RNC debate system is set up to prevent candidates from debating outside the RNC arranged schedule. That's a fair and decent rule. I was just saying that if multiple candidate bail out of the debate conducted by FoxNews, and all participate in a rally, that doesn't turn the rally into a debate. The RNC rule will not have been broken.
Of course, a solitary abstention isn't breaking the rule. Rand Paul absented himself from a debate because he objected to being seated at the kiddie table.
There isn't an equal time rule. Trump is hogging the time anyway!